first you have to find the sum of angles and sides. then subtract 2 which is 18 and multiply 18 times 180.
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20 degrees
Exterior angle = 20 degrees Interior angle = 160 degrees
If it is a regular polygon then each exterior angle is 360/20 = 18 degrees
The measure of one exterior angle of a regular 18-gon is 20°. The sum of all exterior angles of a regular polygon is always 360° so the measure of each exterior angle can be calculated by dividing 360° by the number of sides. In this case that would be: 360° 18 = 20°Therefore the measure of one exterior angle of a regular 18-gon is 20°.
Each exterior angle of a regular 20-agon is: 360/20 = 18 degrees